Re: Doubt regarding C++ using STL ( VERYYY URGENT!!!! PLEASE HELP )

i want to write a simple prog like below using vectors...

#include<vector>
using namespace std
int main()
{
 vector<int> v;
 int i,num;
 for(i=0;i<10;i++)
 {
   num = i;
   cout << num << " ";
  // v.push_back( num );
 }
 int i=10;
 cout << i;
}

But after compiling this code using "gcc" i am getting the following
errors....
****************************************************************************************
vectr_ptr.cpp:4: syntax error before `int'
vectr_ptr.cpp:15: syntax error before `<<' token

/usr/include/c++/3.2.3/bits/stl_algobase.h: In function `const _Tp&
   std::min(const _Tp&, const _Tp&) [with _Tp = size_t]':
/usr/include/c++/3.2.3/bits/stl_algobase.h:793: instantiated from
here
/usr/include/c++/3.2.3/bits/stl_algobase.h:153: `__a' undeclared (first
use
   this function)
/usr/include/c++/3.2.3/bits/stl_algobase.h:153: (Each undeclared
identifier is
   reported only once for each function it appears in.)
/usr/include/c++/3.2.3/bits/stl_algobase.h:153: `__b' undeclared (first
use
   this function)
/usr/include/c++/3.2.3/bits/stl_algobase.h: In function `bool
   std::lexicographical_compare(_InputIter1, _InputIter1, _InputIter2,
   _InputIter2) [with _InputIter1 = const signed char*, _InputIter2 =
const
   signed char*]':
/usr/include/c++/3.2.3/bits/stl_algobase.h:805: instantiated from
here
/usr/include/c++/3.2.3/bits/stl_algobase.h:745: `__last2' undeclared
(first use
   this function)
/usr/include/c++/3.2.3/bits/stl_algobase.h:745: `__first2' undeclared
(first
   use this function)
/usr/include/c++/3.2.3/bits/stl_algobase.h:745: `__last1' undeclared
(first use
   this function)
/usr/include/c++/3.2.3/bits/stl_algobase.h:745: `__first1' undeclared
(first
   use this function)

********************************************************************************************

i am getting the above errors only when i include this stmt in the code
:

" using namespace std "

if i remove the statement from the code, i'm getting the following
errors....
*****************************************************************************************
vectr_ptr.cpp: In function `int main()':
vectr_ptr.cpp:6: `vector' undeclared (first use this function)
vectr_ptr.cpp:6: (Each undeclared identifier is reported only once for
each
   function it appears in.)
vectr_ptr.cpp:6: syntax error before `>' token
vectr_ptr.cpp:11: `cout' undeclared (first use this function)
vectr_ptr.cpp:14: redeclaration of `int i'
vectr_ptr.cpp:7: `int i' previously declared here
vectr_ptr.cpp:14: declaration of `int i'
vectr_ptr.cpp:7: conflicts with previous declaration `int i'
*******************************************************************************************

can anybody please help me in compiling this code successfully and
explain me why am i getting these errors

Thanks...